晶体管工作在截止状态时,其发射结反偏,集电结正偏。
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晶体管工作在饱和状态时,其发射结和集电结均正偏。
A. 对
B. 错
Multiple-choice: For each sentence there are four choices marked A, B, C, and D. Choose the one that best completes the sentence.Please let us know which of our products _______.
A. you are interested
B. are you interested
C. they are interested
D. you are interested in
We are now enclosing a pricelist for all the items you _______ in your letter under reply.
A. required
B. inquired about
C. said
D. informed
We ______ your name and address _______ the Chinese Embassy in Bonn.
A. are learning….from
B. have learned ….from
C. have come to know….of
D. have been given ….from